Two features were added to the Android and iOS clients because they looked promising, but turned out to be less than stellar in practice.
- Scanning barcodes, using the camera on a mobile phone. This was a spinoff of a Google funded project called ZXing, which was mainly mainly concerned with scanning of QR codes. That project has since been defunded, and parked on GitHub. A similar iOS project is now abandonware.
- Using maps and location services. Google kept changing the way that these services worked, while Apple decided to move away from Google Maps altogether, and introduce its own mapping service.
In both cases there were practical difficulties, which would have persisted even if these issues had been resolved. The features were no more than party tricks, even when they worked. I have decided to remove them from both clients.